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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Text;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using Microsoft.Contracts;
using Microsoft.Basetypes;
// A simple visitor for turning a VCExpr into a human-readable string
// (S-expr syntax)
namespace Microsoft.Boogie.VCExprAST
{
public class VCExprPrinter : IVCExprVisitor<bool, TextWriter!> {
private VCExprOpPrinter OpPrinterVar = null;
private VCExprOpPrinter! OpPrinter { get {
if (OpPrinterVar == null)
OpPrinterVar = new VCExprOpPrinter(this);
return OpPrinterVar;
} }
public void Print(VCExpr! expr, TextWriter! wr) {
expr.Accept<bool, TextWriter!>(this, wr);
}
public bool Visit(VCExprLiteral! node, TextWriter! wr) {
if (node == VCExpressionGenerator.True)
wr.Write("true");
else if (node == VCExpressionGenerator.False)
wr.Write("false");
else if (node is VCExprIntLit) {
wr.Write(((VCExprIntLit)node).Val);
} else
assert false;
return true;
}
public bool Visit(VCExprNAry! node, TextWriter! wr) {
VCExprOp! op = node.Op;
if (op.Equals(VCExpressionGenerator.AndOp) ||
op.Equals(VCExpressionGenerator.OrOp)) {
// handle these operators without recursion
wr.Write("({0}",
op.Equals(VCExpressionGenerator.AndOp) ? "And" : "Or");
IEnumerator! enumerator = new VCExprNAryUniformOpEnumerator (node);
while (enumerator.MoveNext()) {
VCExprNAry naryExpr = enumerator.Current as VCExprNAry;
if (naryExpr == null || !naryExpr.Op.Equals(op)) {
wr.Write(" ");
Print((VCExpr!)enumerator.Current, wr);
}
}
wr.Write(")");
return true;
}
return node.Accept<bool, TextWriter!>(OpPrinter, wr);
}
public bool Visit(VCExprVar! node, TextWriter! wr) {
wr.Write(node.Name);
return true;
}
public bool Visit(VCExprQuantifier! node, TextWriter! wr) {
string! quan = node.Quan == Quantifier.ALL ? "Forall" : "Exists";
wr.Write("({0} ", quan);
if (node.TypeParameters.Count > 0) {
wr.Write("<");
string! sep = "";
foreach (TypeVariable! v in node.TypeParameters) {
wr.Write(sep);
sep = ", ";
wr.Write("{0}", v.Name);
}
wr.Write("> ");
}
if (node.BoundVars.Count > 0) {
string! sep = "";
foreach (VCExprVar! v in node.BoundVars) {
wr.Write(sep);
sep = ", ";
Print(v, wr);
}
wr.Write(" ");
}
wr.Write(":: ");
if (node.Triggers.Count > 0) {
wr.Write("{0} ", "{");
string! sep = "";
foreach (VCTrigger! t in node.Triggers) {
wr.Write(sep);
sep = ", ";
string! sep2 = "";
foreach (VCExpr! e in t.Exprs) {
wr.Write(sep2);
sep2 = "+";
Print(e, wr);
}
}
wr.Write(" {0} ", "}");
}
Print(node.Body, wr);
wr.Write(")");
return true;
}
public bool Visit(VCExprLet! node, TextWriter! wr) {
wr.Write("(Let ");
string! sep = "";
foreach (VCExprLetBinding! b in node) {
wr.Write(sep);
sep = ", ";
Print(b.V, wr);
wr.Write(" = ");
Print(b.E, wr);
}
wr.Write(" ");
Print(node.Body, wr);
wr.Write(")");
return true;
}
}
public class VCExprOpPrinter : IVCExprOpVisitor<bool, TextWriter!> {
private VCExprPrinter! ExprPrinter;
public VCExprOpPrinter(VCExprPrinter! exprPrinter) {
this.ExprPrinter = exprPrinter;
}
private bool PrintNAry(string! op, VCExprNAry! node, TextWriter! wr) {
wr.Write("({0}", op);
foreach (VCExpr! arg in node) {
wr.Write(" ");
ExprPrinter.Print(arg, wr);
}
wr.Write(")");
return true;
}
public bool VisitNotOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("!", node, wr);
}
public bool VisitEqOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("==", node, wr);
}
public bool VisitNeqOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("!=", node, wr);
}
public bool VisitAndOp (VCExprNAry! node, TextWriter! wr) {
assert false;
}
public bool VisitOrOp (VCExprNAry! node, TextWriter! wr) {
assert false;
}
public bool VisitImpliesOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("Implies", node, wr);
}
public bool VisitDistinctOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("Distinct", node, wr);
}
public bool VisitLabelOp (VCExprNAry! node, TextWriter! wr) {
VCExprLabelOp! op = (VCExprLabelOp)node.Op;
return PrintNAry("Label " + op.label, node, wr);
}
public bool VisitSelectOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("Select", node, wr);
}
public bool VisitStoreOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("Store", node, wr);
}
public bool VisitBvOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("Bv", node, wr);
}
public bool VisitBvExtractOp(VCExprNAry! node, TextWriter! wr) {
return PrintNAry("BvExtract", node, wr);
}
public bool VisitBvConcatOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("BvConcat", node, wr);
}
public bool VisitIfThenElseOp(VCExprNAry! node, TextWriter! wr) {
return PrintNAry("if-then-else", node, wr);
}
public bool VisitCustomOp(VCExprNAry! node, TextWriter! wr) {
VCExprCustomOp op = (VCExprCustomOp)node.Op;
return PrintNAry(op.Name, node, wr);
}
public bool VisitAddOp (VCExprNAry! node, TextWriter! wr) {
if (CommandLineOptions.Clo.ReflectAdd) {
return PrintNAry("Reflect$Add", node, wr);
} else {
return PrintNAry("+", node, wr);
}
}
public bool VisitSubOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("-", node, wr);
}
public bool VisitMulOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("*", node, wr);
}
public bool VisitDivOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("/", node, wr);
}
public bool VisitModOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("%", node, wr);
}
public bool VisitLtOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("<", node, wr);
}
public bool VisitLeOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("<=", node, wr);
}
public bool VisitGtOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry(">", node, wr);
}
public bool VisitGeOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry(">=", node, wr);
}
public bool VisitSubtypeOp (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("<:", node, wr);
}
public bool VisitSubtype3Op (VCExprNAry! node, TextWriter! wr) {
return PrintNAry("<::", node, wr);
}
public bool VisitBoogieFunctionOp (VCExprNAry! node, TextWriter! wr) {
VCExprBoogieFunctionOp! op = (VCExprBoogieFunctionOp)node.Op;
return PrintNAry(op.Func.Name, node, wr);
}
}
}
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